222k views
0 votes
Find the first four terms of the sequence defined below, where n represents the position of a term in the sequence. Start with n = 1.an = 4(3)n

Find the first four terms of the sequence defined below, where n represents the position-example-1

1 Answer

7 votes

12,36,108,324

1) Since we've been told the Explicit Formula for this Geometric Sequence, then we can find the first four terms, namely:


a_1,a_2,a_3,a_4

2) Thus, plugging into each term n=1, n=2,n=3,n=4 we've got the following below:


\begin{gathered} a_1=4(3)^1=12 \\ a_2=4(3)^2=36 \\ a_3=4(3)^3=108 \\ a_4=4(3)^4=324 \end{gathered}

Note that each term is thrice the previous one. And that is the answer.

User Vladimir Ignatov
by
7.8k points

No related questions found

Welcome to QAmmunity.org, where you can ask questions and receive answers from other members of our community.